Part of the reason—especially to the print dinosaurs among us—is that they're so correct. Broken old media businesses will change or die. Younger audiences will not just read or watch; they must tweet, blog, and update their status, preferably all at once. More broadly, digital networks are reshaping culture, economics, and politics. That's beyond debate. Like most zealots, however, the Web evangelists often seem self-righteous and oblivious to ambiguity.
This trait threatens to limit their appeal even to the already converted.